NAS Timer Adaptation for High-Latency Non-Terrestrial Networks
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Solution Overview
Problem
Next-generation wireless communication systems face challenges in managing delays introduced by high latency links in non-terrestrial networks, particularly in mobility management and session management procedures, due to varying propagation delays in satellite communications.
Innovation Solution
Adaptive timer management is implemented based on the type of radio access network (terrestrial or non-terrestrial) to optimize NAS mobility and session management procedures, considering UE capabilities and registration area RAN types, with the AMF selecting or instructing UE to adjust timer durations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If standard timer durations are used for mobility management and session management procedures, then the management procedures can be executed with simple timer configurations, but delays in message reception and control initiation of message recovery efforts occur in non-terrestrial networks
Solution Approach 1:
The patent applies dynamics by making timer durations adjustable rather than fixed. The AMF dynamically selects timer durations based on the detected RAN type (terrestrial or non-terrestrial network), allowing the system to adapt to varying propagation delays. This resolves the contradiction by enabling the system to handle non-terrestrial network delays without requiring complex custom timer configurations for each scenario.
Solution Approach 2:
The patent changes the parameter of timer duration based on network conditions. By detecting whether the UE is connected to a terrestrial or non-terrestrial RAN, the system modifies the timer duration parameter accordingly. This parameter change allows standard timer configurations to work effectively across different network types, reducing time loss without increasing configuration complexity.
2Reliability
If timer durations are extended to accommodate non-terrestrial network delays, then message recovery efforts can be initiated in time, but communication efficiency decreases due to longer wait times
Solution Approach 1:
The patent applies local quality by tailoring timer durations to specific network conditions. Instead of using a uniform extended timer for all scenarios, the system sets appropriate timer durations locally based on whether the connection is terrestrial or non-terrestrial. This ensures reliable message recovery for non-terrestrial networks while maintaining communication efficiency for terrestrial networks.
Solution Approach 2:
The system changes the timer duration parameter based on the detected RAN type. For non-terrestrial networks, longer timer durations ensure message recovery capability, while terrestrial networks use standard durations to maintain efficiency. This conditional parameter change resolves the contradiction between reliability and productivity.
3Adaptability or versatility
If a single timer duration is used for all network types, then device complexity is minimized, but the system cannot optimize for varying propagation delays in different networks
Solution Approach 1:
The patent applies self-service by having the AMF automatically detect the RAN type and select appropriate timer durations without requiring manual configuration. The system self-adapts to network conditions through automatic detection and selection, providing network type adaptability while keeping the implementation simple. The AMF autonomously determines whether to use terrestrial or non-terrestrial timer durations based on the detected connection type.
Solution Approach 2:
The patent makes the timer selection mechanism universal by implementing a single AMF-based selection process that works for both terrestrial and non-terrestrial networks. The AMF serves multiple functions: it detects the RAN type, selects the appropriate timer duration, and configures the UE accordingly. This multi-functional approach provides adaptability across network types without requiring separate complex timer mechanisms for each network type.
Data Source
AI summary
Aspects relate to delay management techniques to handle delays introduced by high latency links in non-terrestrial networks for non-access stratum (NAS) mobility management and session management procedures. The NAS timers within the user equipment (UE) and core network utilized for mobility management and session management procedures may be configured with different durations, such as a normal duration, an extended duration, or a reduced duration, based on whether the UE is connected to a terrestrial or non-terrestrial radio access network (RAN), one or more capabilities of the UE, and/or the various RAN types (e.g., terrestrial or non-terrestrial) within a registration area that the UE is located in.